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139 lines
3.6 KiB
C
139 lines
3.6 KiB
C
/* Labelled ranges of type IDs.
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Copyright (C) 2019-2020 Free Software Foundation, Inc.
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This file is part of libctf.
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libctf is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; see the file COPYING. If not see
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<http://www.gnu.org/licenses/>. */
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#include <ctf-impl.h>
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#include <string.h>
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static int
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extract_label_info (ctf_file_t *fp, const ctf_lblent_t **ctl,
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uint32_t *num_labels)
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{
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const ctf_header_t *h;
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h = (const ctf_header_t *) fp->ctf_data.cts_data;
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*ctl = (const ctf_lblent_t *) (fp->ctf_buf + h->cth_lbloff);
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*num_labels = (h->cth_objtoff - h->cth_lbloff) / sizeof (ctf_lblent_t);
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return 0;
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}
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/* Returns the topmost label, or NULL if any errors are encountered. */
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const char *
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ctf_label_topmost (ctf_file_t *fp)
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{
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const ctf_lblent_t *ctlp = NULL;
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const char *s;
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uint32_t num_labels = 0;
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if (extract_label_info (fp, &ctlp, &num_labels) < 0)
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return NULL; /* errno is set for us. */
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if (num_labels == 0)
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{
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(void) ctf_set_errno (fp, ECTF_NOLABELDATA);
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return NULL;
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}
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if ((s = ctf_strraw (fp, (ctlp + num_labels - 1)->ctl_label)) == NULL)
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(void) ctf_set_errno (fp, ECTF_CORRUPT);
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return s;
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}
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/* Iterate over all labels. We pass the label string and the lblinfo_t struct
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to the specified callback function. */
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int
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ctf_label_iter (ctf_file_t *fp, ctf_label_f *func, void *arg)
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{
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const ctf_lblent_t *ctlp = NULL;
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uint32_t i;
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uint32_t num_labels = 0;
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ctf_lblinfo_t linfo;
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const char *lname;
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int rc;
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if (extract_label_info (fp, &ctlp, &num_labels) < 0)
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return -1; /* errno is set for us. */
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if (num_labels == 0)
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return (ctf_set_errno (fp, ECTF_NOLABELDATA));
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for (i = 0; i < num_labels; i++, ctlp++)
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{
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if ((lname = ctf_strraw (fp, ctlp->ctl_label)) == NULL)
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{
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ctf_dprintf ("failed to decode label %u with "
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"type %u\n", ctlp->ctl_label, ctlp->ctl_type);
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return (ctf_set_errno (fp, ECTF_CORRUPT));
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}
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linfo.ctb_type = ctlp->ctl_type;
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if ((rc = func (lname, &linfo, arg)) != 0)
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return rc;
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}
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return 0;
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}
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typedef struct linfo_cb_arg
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{
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const char *lca_name; /* Label we want to retrieve info for. */
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ctf_lblinfo_t *lca_info; /* Where to store the info about the label. */
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} linfo_cb_arg_t;
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static int
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label_info_cb (const char *lname, const ctf_lblinfo_t *linfo, void *arg)
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{
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/* If lname matches the label we are looking for, copy the
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lblinfo_t struct for the caller. */
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if (strcmp (lname, ((linfo_cb_arg_t *) arg)->lca_name) == 0)
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{
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/* * Allow caller not to allocate storage to test if label exists. */
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if (((linfo_cb_arg_t *) arg)->lca_info != NULL)
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memcpy (((linfo_cb_arg_t *) arg)->lca_info, linfo,
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sizeof (ctf_lblinfo_t));
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return 1; /* Indicate we found a match. */
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}
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return 0;
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}
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/* Retrieve information about the label with name "lname". */
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int
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ctf_label_info (ctf_file_t *fp, const char *lname, ctf_lblinfo_t *linfo)
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{
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linfo_cb_arg_t cb_arg;
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int rc;
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cb_arg.lca_name = lname;
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cb_arg.lca_info = linfo;
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if ((rc = ctf_label_iter (fp, label_info_cb, &cb_arg)) < 0)
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return rc;
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if (rc != 1)
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return (ctf_set_errno (fp, ECTF_NOLABEL));
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return 0;
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}
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